Re: Which RAID Controllers to pick/avoid?

Thank you everybody for the detailed answers, the help is well appreciated.

A couple of follow-up questions:
- Is the supercap + flash memory considered superior to the BBU in practice?
Is that type of system well tested?
- Is the linux support of the LSI and Adaptec cards comparable?

-Dan

On Wed, Feb 2, 2011 at 10:15 PM, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:

> Scott Marlowe wrote:
>
> On Wed, Feb 2, 2011 at 10:46 PM, Greg Smith <greg(at)2ndquadrant(dot)com> <greg(at)2ndquadrant(dot)com> wrote:
>
>
> example. Scott Marlowe was griping recently about a similar issue in some
> of the LSI models, too. I suspect it's a problem impacting several of the
> larger RAID cards that use the big Intel IOP processors for their RAID
> computations, given that's the part with the heatsink on it.
>
>
> Specifically the LSI 8888 in a case that gave very low amounts of air
> flow over the RAID card. The case right above the card was quite hot,
> and the multilane cable was warm enough to almost burn my fingers whe
>
>
> Interesting...that shoots down my theory. Now that I check, the LSI 8888
> uses their SAS1078 controller, which is based on a PowerPC 440
> processor--it's not one of the Intel IOP processors at all. The 8308 Dan
> has as an option is using the very popular Intel IOP333 instead, which is
> also used in some Areca 1200 series cards (1220/1230/1260).
>
> The Adaptec 5405 and 5805 cards both use the Intel IOP348, as does the
> Areca 1680. Areca puts a fan right on it; Adaptec does not. I suspect
> the only reason the 5805 cards have gotten more reports of overheating than
> the 5405 ones is just because having more drives typically connected
> increases their actual workload. I don't think there's actually any
> difference between the cooling situation between the two otherwise.
>
>
> --
> Greg Smith 2ndQuadrant US greg(at)2ndQuadrant(dot)com Baltimore, MD
> PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us
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>
>